The National Weather Service issued a severe thunderstorm warning for northwestern Grant County and southeastern Wheeler County.

At 1:26 p.m. Wednesday, radar indicated a severe thunderstorm capable of producing half dollar-size hail and damaging winds in excess of 60 mph was 7 miles northwest of Antone, or 12 miles east of Mitchell, moving northeast at 45 mph, according to the warning.

Spray, Monument, Hamilton, Antone and Kimberly could be impacted by the storm. The warning expires for these areas at 3:15 p.m.

The storm was also generating continuous lightning strikes and heavy rain, and the weather service recommended moving indoors to an interior room on the lowest floor.

The weather service also issued a severe thunderstorm watch in effect until 9 p.m. for Grant, Umatilla, Union and Wallowa counties in Oregon and Columbia and Walla Walla counties in Washington, including Dayville, John Day, Long Creek, Monument, Seneca, Athena, Burbank, College Place, Dayton, Elgin, Enterprise, Helix, Hermiston, Imnaha, Joseph, La Grande, Lostine, Milton-Freewater, North Powder, Pendleton, Pilot Rock, Prescott, Stanfield, Starbuck, Troy, Ukiah, Umatilla, Union Waitsburg, Walla Walla and Wallowa.

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